Bobbin-winding device for sewing machines



Dec. 19, 1933. T. c. ORVIS BOBBIN WINDING DEVICE FOR SEWING MACHINES Filed Sept. 9, 1932 grwcm bo a mamas 62' 012215 Patented Dec. 19, 1933 PATENT OFFICE BOBBIN-WINDING DEVICE FOR SEWING' MACHINES Thomas C. Orvis, Bridgeport, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. .L, a corporation of New Jersey ApplicationSeptember 9, 1932. Serial No. 632,276

10 Claims. (Cl. 242-20) This invention relates to improvements in bobbin-Winding devices for sewing machines and has for its primary object to provide a sewing machine with bobbin rotating means including a device of a simple character for automatically disconnecting the stitch-forming mechanism of the machine from its actuating means by the simple act of placing a bobbin upon its rotating means. 7

Other objects of the invention will be apparent from the following description and claims.

The invention consists in the devices, combinations and arrangements of parts hereinafter described in connection with the accompanying drawing, in which:

Fig. 1 is a substantially diametral section of a sewing machine driving pulley constituting a preferred embodiment of the present invention. Figs. 2 and 3 are opposite face views of the 20 pulley, the face-plate shown in Fig. 1 being removed in Fig. 3.

Referring to the drawing, the sewing machine mechanism includesa rotary main shaft 1 and any suitable stitch-forming mechanism, (not shown), operatively connected with said main shaft to 'derive actuation therefrom. According to the present improvement, the usual belt-pulley employed for driving the main shaft is replaced by a combination pulley and bobbinholding spindle device which is normally latched or keyed to the main shaft for rotation therewith, and is disconnected from said shaft when a bobbin is placed upon its holding spindle.

In the preferred embodiment of the improvement, a collar 2 is secured by a pin 3 upon the usual pulley end of the main shaft 1, said collar having at its inner end a'flange 4 peripherally provided with a spiral cam surface 5 in which is formed a latch-receiving notch 6 providing opposed abutment shoulders 7 and 8 of unequal depth.

Rotatably journaled upon the collar 2 is a driving element in the form of a pulley 9 having a central bearing aperture 10 for said collar 2, and in its inner side face an annular recess 11 receiving the collar flange 4, the recess 11 being preferably of slightly greater diameter than the flange. The pulley 9 is held upon the collar 2 by a cover-plate 12 secured upon the inner face of the pulley by screws, as 13. The outer side face of the pulley is also provided with an annular recess 14 in which is force-fitted the hub 15 of a bobbin-supporting spindle 16 extending outwardly beyond the pulley coaxially therewith and with the main shaft 1.

The bobbin-spindle 16 has a slot 17 extending through the spindle-hub 15, and disposed in said slot is an arm 18 of a two-armed latchlever 18, 19 fulcrumed upon a pivot-pin 20 suitably. secured in the spindle-hub 15 to extend across the slot therein. The other arm 19 of the latch-lever is disposed in a slot 21 alined with the spindle slot 17 and extending across the pulley in a direction lengthwise of the main shaft, said slot 21 being of sufficient depth to permit of movement of the free end of the lever-arm 19 into andout of the collar-flange notch 6. The latch-lever arm 19 is normally held in the notch 6 by aspring 22 seated in-a socket 23 provided in the pulley and opening into the slot 21, In the latched position of the lever-arm 19, the other arm 18 of the latchleverprotrudes partly from the spindle slot 17, the protruding portion of said arm 18 having a curved cam-face 24 which at the free end of the arm 18 is preferably substantially flush with the outer face of the bobbin-spindle, but which may be disposed within the slot, if desired.

During the normal operation of the sewing machine, the latch-lever arm 19 is held in the collar-flange notch 6 by the spring 22, the opposed shoulders of the notch 6 providing for rotating the shaft 1 in either direction by manipulation of the pulley 9. When it is desired to wind a bobbin, as 25, having a central spindlereceiving @aperture very slightly larger than the diameter of the spindle, the placing of the bobbin upon the spindle depresses the arm 18 of the latch-lever 18, 19 into the dotted line position illustrated in Fig. 1 of the drawing, thereby effecting withdrawal of the arm 19 from the notch 6 to uncouple the main shaft 1 from the pulley 9. The bobbin is frictionally held against rotation upon the spindle 16 by the lever-arm 18 under the action of the compressed spring 22, and consequently upon rotation of the pulley 9, the bobbin may be readily wound by directing thread thereto. The removal of the bobbin from its spindle releases the latchlever arm 18, the free end of the lever-arm 19 being thereupon depressed by the spring 22 into engagement with the cam-surface of the collar flange to ride said cam-surfaceuntil the arm 19 engages the flange shoulder 8, whereupon the arm is forced by the spring into the notch 6 to again couple the pulley and main shaft.

Having thus set forth the nature of the invention, what I claim herein is:-

1. A sewing machine having a main shaft, a shaft-driving element, a. bobbin-supporting spindle carried by said driving element, and a latch device adapted to disconnectibly couple said shaft and driving element, said latch-device including a member disposed for engagement by a bobbin placed upon said spindle to thereby uncouple said shaft from its driving element.

2. A sewing machine having a main shaft, a driving element journaled for free rotation upon said shaft, a bobbin-supporting spindle carried by said driving element, a latch-device adapted to disconnectibly couple said shaft and driving element, and means including a bobbin placed upon said spindle for holding said latch-device in inoperative position.

3. A bobbin-winding device for sewing machines comprising a rotary actuating shaft, a shaft-driving element, bobbin-supporting means carried by said element for rotation coaxially with said shaft, a latch-device adapted to disconnectibly couple said driving element and shaft, and means including a bobbin placed upon its supporting means for holding said latch-device in inoperative position.

4'. A sewing machine having an actuating shaft, a driving element for said shaft journaled for free rotation coaxially with said shaft, a bobbin-supportingspindle carried by said driving element, and a latch-member pivotally mounted upon said driving eiement for releasably coupling said shaft and'the driving element, said latch-member having its fulcrum axis transverse to the axis of rotation of said shaft and having an arm disposed for engagement by a bobbin placed upon said spindle.

5. A bobbin-Winding device for sewing machines comprising an actuating shaft, a driving element for said shaft journaled for free rotation coaxially with said shaft, a bobbin-supporting spindle carried by said drivingelement, a twormed latch-lever pivotally mounted upon said driving element and having one arm disposed for engagement by a bobbin placed upon said spindle, and a shoulderfixedly carried by said driving shaft for engagement by the other arm of said latch-lever.

6. A sewing machine having an actuating shaft, a driving element for said shaft journaled for free rotation coaxially with said shaft, a bobbin-supporting spindle carried by said driving element, and means engaging a bobbin upon said spindle for rotating said bobbin with the spindle, including a latch-device adapted to releasably couple said shaft and driving element.

7. A sewing machine having an actuating shaft, a driving element for said shaft journaled for free rotation coaxially with said shaft, a bobbin-supporting spindle carried by said driving element and provided with a slot, a latchmember protruding from said spindle slot in position for engagement by a bobbin placed upon the spindle, a shoulder carried by said driving shaft for engagement by said latch-member, and a spring yieldingly urging said latch-member into shoulder engaging position.

8. A sewing machine having an actuating shaft, a collar secured upon said shaft for rotation therewith and provided with an abutment, a driving element journaled for rotation coaxially with and relatively to said shaft, a bobbinsupporting spindle carried by said driving element for rotation therewith, a latch-member fulcrumed upon said driving element and having a pivotal axis transverse to the axis of rotation of said shaft, and a spring urging said latch-member into position for engaging said collar abutment.

9. A sewing machine having an actuating shaft, a collar secured upon said shaft for rotation therewith and having a cam-surface terminating in an abutment shoulder, a driving element journaled for rotation coaxially with and relatively to said shaft, a bobbin-supporting spindle carried by said driving element for rota- 105 tion therewith, a latch-member pivotally mounted upon said driving element and adapted to ride said cam-surface and engage said abutment-shoulder to thereby couple said driving element and shaft, and a spring yieldingly urg- 110 ing said latch-meniber into its operative position.

it. A sewing machine having an actuating shaft, a collar secured upon said shaft for rotation therewith and having a flange providing a spiral cam-surface terminating in an abutment- 115 shoulder, a driving element journaled upon said collar for rotation relatively to said shaft and provided with a slot, a bobbin-supporting spindle carried by said driving element and having a slot in alinement with the driving-element slot, 1:20 a two-armed latch-lever disposed in said slots,

a pivotal support for said latch-lever uponsaid driving element, and a spring acting upon said latch-lever to yieldingly urge one arm of said lever into position for engaging said abutment- 125 shoulder and the other arm of said lever to protrude from said spindle slot.

THOMAS C. ORVIS. 

